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Electron Energy-Loss Spectroscopy (EELS) of Surface Plasmons in Single Silver Nanoparticles and Dimers: Influence of Beam Damage and Mapping of Dark Modes

2009; American Chemical Society; Volume: 3; Issue: 10 Linguagem: Inglês

10.1021/nn900922z

1936-086X

Ai Leen Koh, Kui Bao, Imran Khan, W. Ewen Smith, Gerald Kothleitner, Peter Nordlander, Stefan A. Maier, David W. McComb,

Advanced biosensing and bioanalysis techniques

We demonstrate the use of a scanning transmission electron microscope (STEM) equipped with a monochromator and an electron energy loss (EEL) spectrometer as a powerful tool to study localized surface plasmons in metallic nanoparticles. We find that plasmon modes can be influenced by changes in nanostructure geometry and electron beam damage and show that it is possible to delineate the two effects through optimization of specimen preparation techniques and acquisition parameters. The results from the experimental mapping of bright and dark plasmon energies are in excellent agreement with the results from theoretical modeling.